High-efficiency ultra trace detection of 85Kr

Xinghua Li; Jens Lassen; Hans A. Schuessler

doi:10.1117/12.463835

28 March 2002 High-efficiency ultra trace detection of ⁸⁵Kr

Xinghua Li, Jens Lassen, Hans A. Schuessler

Proceedings Volume 4634, Methods for Ultrasensitive Detection II; (2002) https://doi.org/10.1117/12.463835
Event: High-Power Lasers and Applications, 2002, San Jose, California, United States

Abstract

We have developed a novel version of collinear fast beam laser spectroscopy based on particle detection. The sample to be analyzed is loaded into an ion source and a mass separated fast ion beam is produced. In it we can detect with high efficiency the various krypton isotopes, and in particular the long lived rare isotope ⁸⁵Kr by observing the optical hyperfine structure spectrum. The technique utilizes cascade two-step excitation to pump metastable krypton atoms to a high-lying Rydberg level. The metastable atom level is effectively populated from the Kr ion beam by a near resonance charge exchange reaction with rubidium vapor. Thereupon the Rydberg atoms are field-ionized and the resulting signal ions, which have been at resonance with two laser frequencies, are detected. The following transitions are used in the two-step excitation process: 5s² [3/2]₂ yields 5p² [5/2]₃ yields 29d² [7/2]₄. The technique has been successfully applied to all the stable krypton isotopes, and to ⁸⁵Kr, but not yet to ⁸¹Kr. After the Kr ions are emitted from the ion source the overall detection efficiency is to date 8%. The selectivity is at the one part in 10¹⁰ level and the sensitivity at a few hundred ions/s. Obvious further improvements are possible and are outlined. A similar excitation scheme can also be applied to the other noble gases including radon and to their rare isotopes.

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Xinghua Li, Jens Lassen, and Hans A. Schuessler "High-efficiency ultra trace detection of ⁸⁵Kr", Proc. SPIE 4634, Methods for Ultrasensitive Detection II, (28 March 2002); https://doi.org/10.1117/12.463835

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KEYWORDS

Chemical species

Ions

Ionization

Krypton

Ion beams

Sapphire lasers

Doppler effect

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